General Catholic
What's the difference between 'Catholic' and just 'Christian'?
Every Catholic is a Christian, but 'Catholic' names the specific Church founded by Christ on the apostles, in visible, historical continuity through apostolic succession and communion with the Bishop of Rome, rather than a separate branch alongside other Christian traditions.
Catholic teaching
The Church teaches that the one Church of Christ, possessing the fullness of the means of salvation, 'subsists in' the Catholic Church, while genuinely recognizing that many elements of sanctification and truth exist outside her visible boundaries among other Christians, who remain truly, if imperfectly, joined to Christ.
Biblical foundation
Christ founded a single visible Church on Peter, promising 'the gates of hell shall not prevail against it' (Matt 16:18), and prayed for the unity of all who would believe through the apostles' word (John 17:20-21), grounding the Catholic claim to visible, historical continuity rather than a purely invisible or denominational Christianity.
Scripture references
Historical evidence
The term 'Catholic Church' appears already around AD 107 in Ignatius of Antioch's letter to the Smyrnaeans, showing that from the earliest post-apostolic period Christians identified themselves with this specific visible, universal communion under the bishops, not a generic set of denominations.
The Church Fathers
“Wherever the bishop appears, there let the people be, just as wherever Jesus Christ is, there is the Catholic Church.”